Microsoft Word for OS X does not have auto save. This is a deal breaker if you are an OS X user wanting to use Word. But there are some ways to mimic this functionality using a scripting program like Keyboard Maestro. IF you are trying to get back an old file, Microsoft Word does have a feature called auto-recovery. If Microsoft Word crashed you may be able to recover your document. Also if you have Apple’s Time Machine running on your compute you can recover old versions of Word documents that you have saved over even if Microsoft Word cannot recover them.
Here is how to enable auto saving of files in Microsoft Word and recover old deleted Microsoft Word files if you did not have autosave enabled.